This tool is good for small blemishes and works reliably enough. Note that not all images are equally well suited for this kind of repair. Due to the way the algorithm works, repairs can be near-perfect at one spot, but truly abysmal in another in the same image.
In an image taken on a safari in Africa (hey, I wasn't there, just worked on the image), we removed a jeep without problems, but the result when we tried to remove a (much smaller) tent proved to be impossibly bad (we used a different program for that).
Also, on a personal level, I truly dislike the decidedly Windows-esque user interface (really? A 3.5 inch disk as icon to save.)
But the Application does what is says, and although not particularly fast, it is quick enough and the results are good enough even for studio work (I used it to good effect on a product shoot for a golfing equipment catalog).